/**
 * Copyright (C) 2012 Oleg Anastassov <o.anastasov@gmail.com>
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package kz.kstu.ent.business.server.util.transaction;

import org.apache.geronimo.gbean.AbstractName;
import org.apache.geronimo.gbean.AbstractNameQuery;
import org.apache.geronimo.kernel.Kernel;
import org.apache.geronimo.kernel.KernelRegistry;
import org.hibernate.HibernateException;
import org.hibernate.transaction.TransactionManagerLookup;

import javax.transaction.Transaction;
import javax.transaction.TransactionManager;
import java.util.Properties;
import java.util.Set;

public class GeronimoTransactionManagerLookup implements TransactionManagerLookup {

    public static final String UserTransactionName = "java:comp/UserTransaction";

    public TransactionManager getTransactionManager(Properties props) throws HibernateException {
        try {
            Kernel kernel = KernelRegistry.getSingleKernel();
            AbstractNameQuery query = new AbstractNameQuery(TransactionManager.class.getName());
            Set<AbstractName> names = kernel.listGBeans(query);
            if (names.size() != 1) {
                throw new IllegalStateException("Expected one transaction manager, not " + names.size());
            }
            AbstractName name = names.iterator().next();
            return (TransactionManager) kernel.getGBean(name);
        } catch (Exception e) {
            e.printStackTrace();
            throw new HibernateException("Geronimo Transaction Manager Lookup Failed", e);
        }
    }

    public String getUserTransactionName() {
        return UserTransactionName;
    }

    @Override
    public Object getTransactionIdentifier(Transaction transaction) {
        return transaction.hashCode();
    }
}